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Siderophore activity using the CASAD assay. Wells were filled with cell-free culture supernatants of wild-type C. sakazakii BAA-894 (1), plasmid-cured derivative BAA-894.3 (2), fosmid clone ESA-C01 containing the cronobactin genes (3), and fosmid clone ESA-M04 lacking the cronobactin genes (4).
